Corkscrew



FIG. 1 is a front elevation view of a corkscrew, according to my design; the rear elevation view thereof being identical thereto;

FIG. 2 is a side elevation view thereof; the opposite side elevation view thereof being identical thereto; and,

FIG. 3 is a top plan view thereof. 

The ornamental design for the corkscrew, as shown and described. 